CN114262133A - Low-temperature sludge drying conditioner and use method thereof - Google Patents
Low-temperature sludge drying conditioner and use method thereof Download PDFInfo
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- CN114262133A CN114262133A CN202111535930.3A CN202111535930A CN114262133A CN 114262133 A CN114262133 A CN 114262133A CN 202111535930 A CN202111535930 A CN 202111535930A CN 114262133 A CN114262133 A CN 114262133A
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Abstract
The utility model discloses a sludge low-temperature drying conditioner, which comprises calcium oxide and a flocculating agent, wherein the mass part ratio of the calcium oxide to the flocculating agent is as follows: (50-89) to (11-50). The utility model also discloses a low-temperature sludge drying method which is applied to any one of the low-temperature sludge drying conditioners and comprises the steps S1-S3, wherein the step S1 is to pump the sludge into a dehydrator for preliminary dehydration; step S2, adding the sludge low-temperature drying conditioner into the primarily dehydrated sludge; and step S3, sending the conditioned sludge into a low-temperature drier for low-temperature drying dehydration and then discharging.
Description
Technical Field
The utility model relates to the technical field of sludge treatment, in particular to a low-temperature sludge drying conditioner and a using method thereof.
Background
Sludge is a solid precipitate generated in the sewage treatment process, at present, the main treatment modes of sludge include landfill, land utilization (such as composting), incineration and the like, but no matter which treatment mode is adopted, the sludge needs to be dehydrated firstly.
The common methods for sludge dewatering comprise mechanical dewatering and drying dewatering, and in comparison, the minimum water content of the sludge after mechanical dewatering can only reach 60%, and the water content of the dried and dewatered sludge can reach lower, and due to the obvious difference of the dewatering effects of the mechanical dewatering and the drying dewatering, more and more processing enterprises select a drying dewatering mode to dewater the sludge.
The basic principle of the common low-temperature drying and dehydrating technology at present is to adopt a dehumidifying heat pump to carry out hot air circulation condensation, dehumidification and drying on sludge. Although this technique can achieve higher dehydration rate, correspondingly, the time required for low-temperature drying dehydration is longer, the energy consumption is higher, and the overall efficiency is lower.
These operational drawbacks are all determined by the structural and compositional characteristics of the sludge, the solid particles in the sludge are mainly colloidal particles and have a strong affinity for water, and it is believed that the sludge contains four forms of water, i.e., internal water, attached water, capillary water and pore water. Wherein the bonding strength and the dehydration difficulty are as follows: internal water > attached water > capillary water > pore water. Through sludge conditioning, the moisture can be released more easily step by step.
In addition, in the low-temperature drying process of the sludge, the drying machine cannot be completely sealed due to the temperature rise, and a large amount of odor substances are emitted, so that the working environment of workers is influenced, and the health of human bodies is threatened.
The foregoing description is provided for general background information and is not admitted to be prior art.
Disclosure of Invention
The utility model aims to provide a low-temperature sludge drying conditioner for improving the dehydration rate and deodorization of sludge and a using method thereof.
The utility model provides a sludge low-temperature drying conditioner which comprises calcium oxide and a flocculating agent, wherein the mass part ratio of the calcium oxide to the flocculating agent is as follows: (50-89) to (11-50).
Further, the flocculating agent is one or more of basic aluminum chloride, polyaluminum ferric chloride, polyaluminum sulfate, polyaluminum ferric chloride and polyaluminum ferric silicate.
Further, the flocculant is a mixture of the basic aluminum chloride, the polyaluminum ferric chloride and the polyaluminum sulfate.
Further, the mass parts of the basic aluminum chloride, the polyaluminum ferric chloride and the polyaluminum sulfate are as follows: 60: 18: 15: 7.
The utility model also provides a using method of the sludge low-temperature drying conditioner, which is applied to the sludge low-temperature drying conditioner and comprises the steps S1 to S3, wherein the step S1 is to pump the sludge into a dehydrator for preliminary dehydration; step S2, adding the sludge low-temperature drying conditioner into the primarily dehydrated sludge; and step S3, sending the conditioned sludge into a low-temperature drier for low-temperature drying dehydration and then discharging.
Further, the sludge is primarily dehydrated in the dehydrator in the step S1 to a water content of 80% and then discharged.
Further, the step S2 includes a step S21 and a step S22, and the step S21 is to put the low-temperature sludge drying conditioner into the primarily dewatered sludge in a proportion of 3% to 4.5%; the step S22 is to stir the sludge in the step S21.
Further, in the step S22, the stirring speed is 20-30r/min, and the stirring time is 5-8 min.
Further, in the step S3, the drying temperature of the low-temperature drying machine is 70 to 75 ℃.
According to the low-temperature sludge drying conditioner and the using method, a large amount of heat is released through the reaction of calcium oxide and water in sludge, and the pH value of the sludge is raised to 12-13, so that microorganisms are killed; meanwhile, part of organic matters in the sludge are decomposed into inorganic calcium salt under the conditions of high heat and high alkalinity, and organic matters such as protein, saccharides and lipids in the sludge are subjected to chelation reaction and complexation reaction under the conditions of high temperature and high alkalinity, so that the content of the organic matters is reduced, and the organic matters available to microorganisms are reduced, thereby having better deodorization effect; the charged colloidal particles are destabilized by neutralizing the charges on the surface of the sludge through the flocculating agent, so that the sludge is flocculated into clusters, and the difficulty in sludge dewatering is reduced; along with the drying, the microbial cell membrane is broken, the internal bound water is converted into external free water, and the whole drying rate is greatly improved because the barrier of the external free water drying is broken through.
Detailed Description
The following examples are given to further illustrate the embodiments of the present invention. The following examples are intended to illustrate the utility model but are not intended to limit the scope of the utility model.
First embodiment
The utility model provides a sludge low-temperature drying conditioner, which comprises 50-89% of calcium oxide and 11-50% of flocculating agent by mass, and is prepared by mixing two powdery components. The flocculant may be one or more of basic aluminum chloride, polyaluminum ferric chloride, polyaluminum sulfate, polyaluminum ferric chloride, and polyaluminum ferric silicate, and in this embodiment, the flocculant is basic aluminum chloride.
Calcium oxide can react with water in the sludge to release a large amount of heat, and the reaction formula is shown as follows.
CaO+H2O→Ca(OH)2+ Heat quantity
On one hand, the water content of the sludge can be reduced by the reaction of calcium oxide and water; on the other hand, the product calcium hydroxide after the reaction raises the pH value of the sludge to 12-13, thereby killing microorganisms. Meanwhile, part of organic matters in the sludge are decomposed into inorganic calcium salt under the conditions of high heat and high alkalinity, and organic matters such as protein, saccharides and lipids in the sludge are subjected to chelation reaction and complexation reaction under the conditions of high temperature and high alkalinity. For example, the reaction formula of calcium hydroxide and glutamic acid to produce calcium glutamate chelate is shown below.
The calcium oxide can reduce the content of organic substances through the reactions, and the organic substances available to microorganisms are reduced, so that the deodorant effect is better.
The flocculating agent neutralizes charges on the surface of the sludge, so that charged colloidal particles are destabilized, the sludge is flocculated into clusters, and the sludge dewatering difficulty is reduced; along with the drying, the microbial cell membrane is broken, the internal bound water is converted into external free water, and the whole drying rate is greatly improved because the barrier of the external free water drying is broken through.
The embodiment also provides a use method of the sludge low-temperature drying conditioner, which is applied to the sludge low-temperature drying conditioner and comprises the steps S1 to S3. And step S1, pumping the sludge into a dehydrator for primary dehydration, and discharging the sludge after the water content of the sludge is reduced to 80%.
Step S2 includes step S21 and step S22, and step S21 is to put the sludge low-temperature drying conditioner into the sludge primarily dehydrated in step S1 according to the proportion of 3% -4.5%. Step S22 is to stir the sludge added with the conditioner, wherein the stirring speed is 20-30r/min, and the stirring time is 5-8 min.
And step S3, delivering the conditioned sludge into a low-temperature drier for low-temperature drying dehydration and discharging, wherein the drying temperature of the low-temperature drier is 70-75 ℃, and the drying time is 2 hours.
Experiments are carried out according to the mode, three groups of sludge low-temperature drying conditioners with different components are taken to treat the same sludge according to the using method, and the components and the adding amount of the sludge low-temperature drying conditioners are shown in the following table 1.
TABLE 1
According to experimental data, the drying effect after sludge treatment is not ideal by only adding calcium oxide, and the deodorization effect after sludge treatment is not ideal by only adding basic aluminum chloride.
And treating the same sludge by using the low-temperature sludge drying conditioner with three different components according to the using method. Wherein, the adding amount of the sludge is 3 percent, and the obtained experimental data are shown in the following table 2.
TABLE 2
According to experimental data, the water content of the sludge treated by the three experimental groups is reduced compared with that of the sludge treated by a control group without the conditioner. The sludge without the conditioner is dried to be blocky, the drying effect is poor, the sludge with the conditioner still keeps a strip shape after being dried, and the drying effect is better. Meanwhile, compared with the control group, the odor concentration and the ammonia concentration of the sludge treated by the three experimental groups are reduced.
In a certain range, the concentration of odor and the concentration of ammonia in the sludge are in negative correlation with the specific gravity of calcium oxide, and the higher the specific gravity of the calcium oxide is, the lower the concentration of odor and the concentration of ammonia are; the water content of the sludge is in negative correlation with the specific gravity of the basic aluminum chloride, and the higher the specific gravity of the basic aluminum chloride is, the lower the water content of the sludge is. Therefore, the experiment verifies that the optimal component proportion of the low-temperature sludge drying conditioner comprehensively considers the parameters of the water content, the odor concentration and the ammonia gas concentration of the sludge is as follows: the mass percent of the calcium oxide is 62 percent, and the mass percent of the basic aluminum chloride is 38 percent.
According to the low-temperature sludge drying conditioner provided by the embodiment, a large amount of heat is released through the reaction of calcium oxide and water in sludge, and the pH value of the sludge is increased to 12-13, so that microorganisms are killed; meanwhile, part of organic matters in the sludge are decomposed into inorganic calcium salt under the conditions of high heat and high alkalinity, and organic matters such as protein, saccharides and lipids in the sludge are subjected to chelation reaction and complexation reaction under the conditions of high temperature and high alkalinity, so that the content of the organic matters is reduced, and the organic matters available to microorganisms are reduced, thereby having better deodorization effect; the charged colloidal particles are destabilized by neutralizing the charges on the surface of the sludge through the flocculating agent, so that the sludge is flocculated into clusters, and the difficulty in sludge dewatering is reduced; along with the drying, the microbial cell membrane is broken, the internal bound water is converted into external free water, and the whole drying rate is greatly improved because the barrier of the external free water drying is broken through.
Second embodiment
The sludge low-temperature drying conditioner provided by the second embodiment of the utility model is different from the above embodiments in that the flocculating agent is a mixture of basic aluminum chloride, polyaluminum ferric chloride and polyaluminum sulfate. The mass percent of the basic aluminum chloride is 60 percent, the mass percent of the polyaluminum chloride is 18 percent, the mass percent of the polyaluminum ferric chloride is 15 percent, and the mass part ratio of the polyaluminum sulfate is 7 percent.
As used herein, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, including not only those elements listed, but also other elements not expressly listed.
As used herein, the meaning of "a plurality" or "a plurality" is two or more unless otherwise specified.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (9)
1. The low-temperature sludge drying conditioner is characterized by comprising calcium oxide and a flocculating agent, wherein the mass part ratio of the calcium oxide to the flocculating agent is as follows: (50-89) to (11-50).
2. The low-temperature sludge drying conditioner as claimed in claim 1, wherein the flocculant is one or more of basic aluminum chloride, polyaluminum ferric chloride, polyaluminum sulfate, polyaluminum ferric chloride and polyaluminum ferric silicate.
3. The low-temperature sludge drying conditioner as claimed in claim 2, wherein the flocculant is a mixture of the basic aluminum chloride, the polyaluminum ferric chloride and the polyaluminum sulfate.
4. The low-temperature sludge drying conditioner as claimed in claim 3, wherein the mass parts of the basic aluminum chloride, the polyaluminum ferric chloride and the polyaluminum sulfate are as follows: 60: 18: 15: 7.
5. The use method of the sludge low-temperature drying conditioner is applied to the sludge low-temperature drying conditioner as claimed in any one of claims 1 to 4, and is characterized by comprising the steps S1 to S3, wherein the step S1 is to pump the sludge into a dehydrator for preliminary dehydration; step S2, adding the sludge low-temperature drying conditioner into the primarily dehydrated sludge; and step S3, sending the conditioned sludge into a low-temperature drier for low-temperature drying dehydration and then discharging.
6. The method for using the low-temperature sludge drying conditioner as claimed in claim 5, wherein the sludge in the step S1 is discharged after being primarily dehydrated in the dehydrator to 80% of water content.
7. The method for using the low-temperature sludge drying conditioner as claimed in claim 5, wherein the step S2 includes a step S21 and a step S22, and the step S21 is to put the low-temperature sludge drying conditioner into the primarily dewatered sludge in a proportion of 3% to 4.5%; the step S22 is to stir the sludge in the step S21.
8. The use method of the sludge low-temperature drying conditioner as claimed in claim 7, wherein in the step S22, the stirring speed is 20-30r/min, and the stirring time is 5-8 min.
9. The method for using the low-temperature drying conditioner for sludge according to claim 5, wherein in the step S3, the drying temperature of the low-temperature drying machine is 70-75 ℃.
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Citations (6)
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| WO2000047527A1 (en) * | 1999-02-08 | 2000-08-17 | 's.A. Lhoist Recherche Et Developpement' | Method for conditioning sludge |
| CN103641286A (en) * | 2013-12-09 | 2014-03-19 | 沈阳铝镁设计研究院有限公司 | Sludge stabilizing method |
| CN105417928A (en) * | 2015-12-28 | 2016-03-23 | 南京神克隆科技有限公司 | Method for municipal sludge in-situ detwatering by utilization of Fenton sludge |
| CN112794621A (en) * | 2020-12-27 | 2021-05-14 | 同济大学 | Efficient sludge dewatering composite conditioning agent and application thereof |
| CN112811774A (en) * | 2020-12-29 | 2021-05-18 | 同济大学 | Sludge compound conditioning and deep dehydration medicament and method |
| CN113149398A (en) * | 2021-04-30 | 2021-07-23 | 玖龙纸业（东莞）有限公司 | Improved papermaking sludge treatment method |
-
2021
- 2021-12-15 CN CN202111535930.3A patent/CN114262133A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000047527A1 (en) * | 1999-02-08 | 2000-08-17 | 's.A. Lhoist Recherche Et Developpement' | Method for conditioning sludge |
| CN103641286A (en) * | 2013-12-09 | 2014-03-19 | 沈阳铝镁设计研究院有限公司 | Sludge stabilizing method |
| CN105417928A (en) * | 2015-12-28 | 2016-03-23 | 南京神克隆科技有限公司 | Method for municipal sludge in-situ detwatering by utilization of Fenton sludge |
| CN112794621A (en) * | 2020-12-27 | 2021-05-14 | 同济大学 | Efficient sludge dewatering composite conditioning agent and application thereof |
| CN112811774A (en) * | 2020-12-29 | 2021-05-18 | 同济大学 | Sludge compound conditioning and deep dehydration medicament and method |
| CN113149398A (en) * | 2021-04-30 | 2021-07-23 | 玖龙纸业（东莞）有限公司 | Improved papermaking sludge treatment method |
Non-Patent Citations (1)
| Title |
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| 杨作清等: "《钢铁工业水处理实用技术与应用》", vol. 1, 冶金工业出版社, pages: 147 * |
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